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Histology > Muscle > Flashcards

Flashcards in Muscle Deck (21):
1

Myoblast origin

mesoderm

2

Endomysium make up

CT: reticular fibers and external lamina

3

Perimysium makeup

CT

4

Epimysium makeup

DCT

5

What is a muscle fascicle

Group of muscle fibers

6

Does skeletal muscle regenerate?

Yes-via satellite cells

7

Does cardiac muscle regenerate?

No

8

T tubules in cardiac muscle located?

At Z line

9

T tubules in skeletal muscle located at?

Junction of A-I bands

10

Dyad

Seen in cardiac muscle

One T tubule (at Z line) and one part of SR terminal end

11

Cardiac innervation

Involunatry

12

Cardiac muscle and mitochondria

Mito is very abundant in CM. Almost half of cell volume.

13

What's at the ends of cardiac muscle?

Intercalated discs. Junction between cells ends=gap junctions that allows communication.

14

What muscles have and lack myofibrils

Have
Skeletal
Cardiac

Lack
Smooth muscle

15

Describe T tubules of the muscles

Skeletal
T tubules at junction of A-I bands

Cardiac
T tubules at Z lines

Smooth
Lack T tubules

16

What muscle is able to secrete ECM. What cell is this similar to in ECM production regards

Smooth

Similar to fibroblast

17

Cab smooth muscle regenerate?

Yes all byyyyyy themmmmselves

Pericytes can help too though.

18

What muscles have myofribrils and myofilaments

Cardiac and skeletal muscle have both

Smooth only has myofilaments (which are not highly organized). Lacks troponin

19

Dense body in smooth muscle

Z line

20

Unitary muscle smooth muscle

Few cells are innervated (works as syncytium via gap junctions). Muscle fibers form as band or bundles

21

Multi-unit smooth muscle

Inidividually innervated. No gap junctions. Muscle fibers are individually located.